Question

Write a method rem() that takes as input a list containing, possibly, duplicate values
and returns a copy of the list in which one copy of every duplicate value removed.

> rem([4])
[]

> rem([4, 4])
[4]

> rem([4, 1, 3, 2])
[]

> rem([2, 4, 2, 4, 4])
[2, 4, 4]

How do I go about doing this? Do I make a new list that contains the duplicates?

Answer 1

def rem(a):
    copy = a[:]
    for value in set(copy):
        copy.remove(value)
    return copy